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Concentrations of credit risk and major customers - Narrative (Details) - Total Revenue | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Foreign customers |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 28.00% | 26.00% | 23.00%
State government agencies |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 46.00% |  |
Foreign government agencies |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 26.00% |  |
United States Based Federal Government Agencies |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 22.00% |  |
Other sources including local municipalities and commercial customers |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 6.00% |  |
U.S. Federal |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 22.00% | 20.00% | 17.00%
United Kingdom Government |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 16.00% |  |
State of New York |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 12.00% | 10.00% |
Minimum | U.S. Federal |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 10.00% |  |
Minimum | United Kingdom Government |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 10.00% |  |
Minimum | State of New York |  |  |
Revenue Recognition |  |  |
Revenue from major customers (as a percent) | 10.00% |  |

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